Talk:Architectural glass
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[edit] Photos
This page needs the existing photos replaced with photos of the glass types discussed in a construction/building/architectural situation.
Parasite 02:50, 3 May 2006 (UTC)
[edit] Auto glass?
There seems to be absolutely no discussion about safety glass used in automobiles, even though the page redirects here....(unsigned)
I don't know the date of the above comment, but I also got to this topic via "safety glass". I found auto glass under Laminated Glass (windshields) and Tempered Glass (side/back windows); seems ok, albeit somewhat buried. Dwight666 16:30, 18 March 2007 (UTC)
- This article is about Architectural glass. The discussion of the use of such glass in Automobiles is incidental to the article. Someone perhaps should write ann article dedicated to the types of glass used in automobiles, specifically.--Amandajm 01:30, 12 May 2007 (UTC)
[edit] There may be one type missing
I came to this article looking for information on a type of architectural glass that can be identified only when it is struck by a projectile (rock, hammer, bullet, whatever). When struck by a point object, the glass spalls, ejecting a flattened cone from the other side (the cone has an obtuse apex angle, 120° or so). This is one-way behavior; if struck from the other side, the glass doesn't spall, but just cracks.
I have seen this glass in the lobby windows of an industrial building (with a couple bullet holes in it), as well as some wire-reinforced glass in the doors of an apartment building (at which someone had thrown a rock). In all cases one finds a broad cone-shaped hole in the glass, with the apex of the cone on the impact side.
After reading this article, I still don't know what it is. I would like to learn about the process used to create the spalling behavior; I have an application in my job where this spalling is actually useful. =Axlq (talk) 01:16, 7 February 2008 (UTC)
- Update: the spalling I described is called a Hertzian cone crack. I'm pretty sure I've seen glass that does this in one direction, although the sources I can find don't indicate any directional dependence. =Axlq (talk) 01:34, 7 February 2008 (UTC)
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- I've observed it, in both windows and flakestone tools. In flakestone tools, you need to have a stone with glasslike properties to achieve it. Obsidian is the ideal stone of course, and obsidian was one of the most traded commodoties in Neolithic times. Only some stone tools are proper flakestone tools. Otheres are ground or chipped but not pressure flaked. The stone is made into a toolshape by knocking chips off using another rock as a striker. When the tool is roughly arrowhead or knife shaped, then you take a pointed implement which is hard, but can be softer than the stone, like a piece of bone, or hardwood with a sharply pointed end. Then you use it after the manner of a chisel. It is set at a slight angle to the surface and given a sharp tap so that the whole force of the blow impacts on a single point. The piece of stone will fly off, leaving a curved indent which is part of a shallow cone. You repeat this all along the edge of the tool on one or both sides and you end up with a scalloped edge that is very sharp. Some of the most beautiful objects remaining from prehistoric times are flakestone tools.
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- The Australian Aboriginal people made flakestone tools in some regions until quite recently. (In other places the flakestone tool industry seemed to have died out.) The Australian Museum in Sydney holds a couple of splendid examples made in the Northern Territory from broken bottles. Amandajm (talk) 15:40, 9 February 2008 (UTC)
